Miley Cyrus

Pulls a Monica Lewinsky

... on Clinton Impersonator

2/15/2014 8:39 AM PST BY TMZ STAFF

Miley Cyrus proved she knows how to party in the U.S.A. AND Canada Friday night ... by simulating fake oral sex on stage in Vancouver on a Bill Clinton impersonator.

It was all for the debut concert on Miley's "Bangerz" tour -- which was filled with little people dressed as joints, giant stuffed animals, and a lot of ass -- but the big finish was her rendition of "Party in the U.S.A."

During the song ... Miley's dancers dressed up as famous American icons to pay tribute to our country -- and when Bill hit the stage Cyrus quickly dropped to her knees in his honor.